Hyosung gt comet 125 2003year Carb main jet help

[Nimbi]

So I want to upgrade my jets and i don’t know what jets to use i found some main jets from mikuni but i dont know if they will fit my stock carb

[♠️ M77]

There is a tutorial on the site , that helps you rich the current jets without really needing to upgrade them.  Type in “Slide Mod” in the search box of the site. See how she runs , look at your plugs, if they are brown all over, leave it there.

If in doubt,  take 4 photos  = 2x Front 2x rear  (eg. for front plug = 1 photo showing the inside of the plug and other  photo showing the the spiral threads to see how dark they get based on heat)

Do this with fresh air filter  (just get another stock air filter) and get CR8E plugs again  (not CR7 or CR9 , if someone tells you to get CR7 , question their brains!)

[Nimbi]

[♠️ M77]

hmmm thats suggesting , potential valve seat oil leak + overheating.

try fresh plugs (brand new ones) , take them out again and let us know.   I’d be more concerned of the white cone in the middle, it needs to be muddy light brown (like clay)

[Nimbi]

i changed them at a motorcycle shop and asked the mechanics i woork with and they said the back plug the one thats on the first 2 pics wasnt tightent at all.

I changed them and now the bike runs a lot better

[Author]

Posts

[Nimbi]

So I want to upgrade my jets and i don’t know what jets to use i found some main jets from mikuni but i dont know if they will fit my stock carb

[♠️ M77]

There is a tutorial on the site , that helps you rich the current jets without really needing to upgrade them.  Type in “Slide Mod” in the search box of the site. See how she runs , look at your plugs, if they are brown all over, leave it there.

If in doubt,  take 4 photos  = 2x Front 2x rear  (eg. for front plug = 1 photo showing the inside of the plug and other  photo showing the the spiral threads to see how dark they get based on heat)

Do this with fresh air filter  (just get another stock air filter) and get CR8E plugs again  (not CR7 or CR9 , if someone tells you to get CR7 , question their brains!)

[Nimbi]

[♠️ M77]

hmmm thats suggesting , potential valve seat oil leak + overheating.

try fresh plugs (brand new ones) , take them out again and let us know.   I’d be more concerned of the white cone in the middle, it needs to be muddy light brown (like clay)

[Nimbi]

i changed them at a motorcycle shop and asked the mechanics i woork with and they said the back plug the one thats on the first 2 pics wasnt tightent at all.

I changed them and now the bike runs a lot better

[Author]

Posts